THE THERMAL CONDUCTIVITY OF METALS. WC 
pipe flame to allow the wire to be taken out. A short piece was then cut off and the 
shortened wire again soldered into the ball. 
TaBLeE I].—Showing rise of Temperature of Calorimeter Ball with time. 








Diameter of wire = ‘210 centim. Temperature readings taken every half-minute. 
Length Length Length Length Length 
=6°31 centims. =5'87 centims. =} (O}, =4°39 centims. =4-01 centims. 
| Temp. reading at | Temp. reading at| Temp. reading at| Temp. reading at | Temp. reading at 
| every half-minute. | every half-minute. | every half-minute. | every half-minute. | every half-minute. 
BC: =r °C. °C. mac! 
6-45 6:25 7-0 6°65 735 
6°65 645 0:25 6°95 a7 
6 85 67 75 72 8:0 
7:05 69 775 745 83 
7:25 71 8:0 77 86 
745 73 8:2 80 8:95 
7-65 75 8-4. 8:25 9°25 
7°85 775 8°65 8:5 9:55 
8-05 095 8°85 875 9°85 
8:25 8-2 all 9:05 10°15 
8-45 | 8-4 9°35 9°3 10°40 
8°65 | 86 9°55 9-6 10°75 
8°85 | 88 9°8 9°85 11:05 
9-05 9-0 10-0 10-1 11°36 
9-2 9-2 10-2 10°35 11-65 
9-4 94 | 10-4 10°6 11-9 
9°55 9-6 10°65 108 12:2 
9°75 9°8 10°85 10:05 125 
9°95 10-0 11:05 | 11:3 12°75 
1071 10°15 11-25 115 13:0 
| 103 10°35 11-45 | 11°75 13°25 
10°45 10°55 | 11°65 | 12:0 13:5 
10°65 10°75 | 12-1 | 12:25 138 
10:85 109 | 123 12-45 14.05 
10°35 1 12°5 | 12:7 143 
1115 | 11°25 | 12-7 12:95 14°55 
113 | 11-45 12:9 | 13:15 148 
11°45 11:65 | 13:05 13°35 15-1 
116 118 | 13°25 13°56 15°35 
11:3 12-0 138 156 
11-95 | 12°15 140 15°85 
12-1 12:35 14-25 16-1 
12-25 12°55 | 14-45 168 
12-4 | 16°55 
126 | 168 
12°75 | 
12-9 
3-05 
al OY ees : ae 
Temp. of air 9°85 C.| Temp. of air 9°11 C.| Temp. of air 10°-0 C.) Temp. of air 10°35 C., Temp. of air 12°3 C. 
| Temp. of hot water | Temp. of hot water | Temp. of hot water | Temp. of hot water | Temp. of hot water 
97°°3 C. | SOIC: 97°-0 C. 96°4° C. 96°°7 C. 


| 


MDCCCXCV.— A. Die 

